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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21004c5201568cda72c70b3e0cb139679a77bb5f6a16677fd4e670a84021e3a2' 
  AND token = 'JjA3plXY35e9IL7Isa6fmutwuNUKqHn8mPJ+4aNe8Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}